Electrical heater



l' I. P/atenfed' vMar. 16., i 1926.

WALTEB|`WHITTEN, OF SCHENECTAQY, NEW YORK.

-ELEccmien.' HEATER.

To allfwkom z't may concern.'

Be it known that iI, WALTER WRITTEN, a citizen of the UnitedStates, and a resident of Schenectady,.in the countyl of Schenec- 6 tady and State' of New York, haveb invented f a new and Improved Electrical Heater, vof which the following is a full, clear, and

exact description. y.

This 'invention relates to a new and im- 10 proved form' of electricheater which makes v use of the action of eddy currents in a substantially solid core offprcferabl'y magnetic metal or material. J Another object is topro'vide means where- 'by the heat generated in a substantially solid core of metal is most efficiently transmitted to a circulating medium to be heated.

' ,g -'A further object concerns the provision'of `means whereby theniost efiicient transmissionof the heat is effected. The invention is illustrated in the drawings, of which Figure 1' is a sectional vievvfthroughone` form` of the heater;

2 5 Fig. 2 is a horizontal section(taken on the line 2 2 'of Fig. 1;

Figi?) is a sectional view fthrough a modified form of heater;

Fig. 4 is`a horizontal section taken on the line 4 4 of Fig. 3;

Fig. V5 -is a sectional view through a still further modified form of heater;

. Fig. 6 is a horizontal section taken on the line 6 6 of Fig. 5;

. Fig. 7 vis a side elevationof a still further modification o f heater f Fig. 8 is a horizontal section taken o1 1 the lines-e ofrig-7; u -v Fig. 9 is 'a'plan-view of a, modified form r 40 of core;

l may be adopted without departing from the spirit of the invention as set forth in theV ap ended claims. i

n general, the invention contemplates the 'provision of a substantially solid core of `5 5 metal provided with passages' therein for the flow of a fluid tol be heated. Thesepassages are'suitably connected t8 a circulating I s stem; The core is intimately associated ith a winding'to which alternating current of any desired :frequency is supplied. 'The result' of'the rise and -fall of flux in the metal of the core is the production of eddy current in the core which produces heat, and this heat is transmitted to the fluid moving through the passages.

vIn the form of the invention shown in Fig.' 1 a core of metal l is provided. This core' is provided with detachable plates 2 and 3. Through the core in the plates there is lformeda tortuous passage 4 having straight yport-ions lying in the-core 1 and bends such as 5 formedjn the plates 2y and 3.- By removing the plates the straightportions of' the passage can be cleaned out.-

Thefends of the passages are connected to pipes 6 and 7 "which may lead to any suitable' circulating system. Disposed around the core -1 andthe plates 2 and 3 is a sheet i 8, preferably of insulating material, and ,wrapped around'this sheet is a coil 9 to which an alternating potential is a plied. The rise or fall of flux-produced in till) will cause eddy currentswhich will heat up the core and, consequently, heat up the fluid flowing through the passage 4.

`In Fig. 3 .a similar passage is provided on the core, and the same sort ofa winding Lis provided; but--the upper end of the core Iis snugly embraced by an enclosing casing 10, and the upper end of the passage 4 opens into'the casing,as shown at 11, 12 and 13, and the casing itself is provided with, a plu'- rality of discharge apertures such as 14. This'construction is' provided incase the fluid to be heated is a gas, and the discharge apertures 14 may be connected by suitable pipe (not shown) to various parts of the circulating system.

In Fig. 5 a central core 15 is formed andl provided with 'vertically extending passages 16. This core is'surrounded by a cylindrical shell 17 Ualso provided `with passages 18, and /the central core and the shell are 'connected 'by upper and `lower perforated rings 19. A winding-20 surrounds the central core, and the eddy currentproduced in this central core causes heat and transmits" itself throughout the entire magnetic frame thus produced.

In Fig. 7 a rectangular magnetic frame 21 is provided, having a central crosspiece 22 on which a coil 23 is mounted.

-In Fig. 9 I show'a solid core through which a plurality of large passages vsuch as 24 are provided, and in each of these passages there are 'disposed a plurality of small pipes such asV 25. Through the large passages a liquid or gas can be passed to be In Fig. 1l the diagram shows three separate sections ot' a coil 27, 28 and 29 eachl `connected by separate switches to the circuit.

It will be understood that I have pro- 'Vided a simple and eflicient type of heating device whereby the heat effect of eddy currents is most leiificient and may be used in a 4in a circulating medium.

plurality of Ways for the generation of heat What I claim is 1; An electrical heater which comprises a 25 central, substantially solid core having vertically extending passages therethrough, ,a cylindrical shell surrounding said core, said shell having ,vertical passages extending therethrough,'upper and lower perforated 30 plates connecting the core with the shell, and an alternating current winding surrounding said core.v

2,-An electrical heater which comprises a central substantially solid core having 35 vertically extending passages therethrough, a cylindrical shell having vertical passages extending therethrough, upper and lower plates connecting the core with the shell and an alternating current winding surrounding 40 the core.

WALTER WHITTEN. 

